Hacksaw-frame.



. PATBNTED 0011.16, 1906.l ,A-ADAMKIBWITZ.'

HAGKSAW FRAME.

APPLICATION FILED NOV. 8. 1905.

mvg/vm@ ANTON ADAMKIEwl-rz v Arron/VHS l ANTON ADAMKIEWITZ, OF CHICAGO, ILLINOIS.

HACKSAW-FRAME.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application led November 8, 1905. Serial No. 286,352.

To a/ZZ whom it may concern:

Be it known that I, 'ANTON ADAMKIEWITZ,A

a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Hacksaw-Frames, of which the following is a specification.

My invention relates to improvements in hacksaw frames and handles, and has for its obj ect to produce a saw for use by machinists and others in which the blade can be readily and quickly removed for sharpening and one in which the blade when not in use can be relieved of all strain.

To these ends my invention consists in certain novel features of construction, arrangement, and combination of parts, as will be hereinafter fully described, and pointed out in the claims, reference being had to the accompanying drawings, in which Figure 1 is a side elevation of a hacksaw and frame embodying my improvements. Fig. 2 is an enlarged sectional view of handle of same. Fig. 3 is a perspective view of the operating-lever. Fig. 4 is a detail sectional view of handle, showing position of parts in unlocking the saw-blade or relieving the same of strain. Fig. 5 is a sectional view showing the parts in locked position.

In carrying out my invention I use the frame A, having at its rear end the handle B.

C is the saw-blade, provided at each end with an eye c.

D is an adjustable arm fitted to slide at its upper end on the frame A and to be held thereon at any point by a shouldered key d and set-screw d. The lower end of arm D is also provided with an enlargement d3, which has a forward extension d4. This enlargement has extending through it an opening, and the forward edge of the extension is serrated or notched, as at d5, to receive a pin or feather e on the stub-shaft E, which extends through the opening in the enlargement which forms a bearing or journal for said stub-shaft, and has its rear end flattened, as at e', said flattened portion having the hook e2, which engages the forward eye of the sawblade C.

The handle B is made open or of skeleton construction, the extreme lower end of the frame having a socket or bearing b in the same communicating with the open portion of the handle. Through this bearing or socket passes the stub-shaft F, the forward end of which is flattened, as at f, and provided with the hook f', which engages the rear eye of the saw-blade. Within the bearing or socket b is fitted the shouldered key b', which is held in place by the set-screw b2. This key fits in a seat in the bearing and alongside pin F, and by means of the key and set-screw the stub-shaft' F may be clamped in position within the bearing or socket b.

A sleeve Grof suitable size fits around the pin F at its rear end within the open part of the handle and serves to maintain the shaft F in alinement and acts as a guide for the same. To the rear end of the stub-shaft F is secured the block H by the screw h, which passes through said block into the rear end of the in.

I are flat links secured at their forward.

ends to the block H by the pins i, which fit in the sockets h in the sides of said block. These links have spaces 'i' cut out, which fit over the cross-pin J, which passes through the sides of the handle. The rear ends of the links are fastened to the lever K by the pin k passing through the same. The lever K is provided with a tongue K', where the links are secured to it, said tongue being provided with the side projections 7c and square shoulders k2, against which the rear ends of links I abut. These links have their rear ends beveled off, -as shown at i2. The lever K fits within the open part of the handle and is provided at its rear end with a slot 7c3, into which projects a pin k, secured to the handle B. The side projections k fit within the cut-out spaces i of the links I, the front wall of said spaces resting squarely against the side projections k when the saw-blade is locked, as in Fig. 5. It will be seen that when the lever K is thrown to the position shown in Fig. 4 the forward part of same swings on pin J and the links turn on the pin k. The forward ends of the links are carried forward, the block H being also carried forward as it is connected to the links by the pins i.. This forward movement of block H carries the stub-shaft F forward and removes the tension from the sawblade C and permits the same to be removed from engagement with the hook f. The arm D being adjustable also permits the use of different lengths of blades in the same frame and also providesv means for regulating the strain to be put on the blade.

When the lever K is thrown down to the position shown in Figs. 2 and 4, it swings on the pin J as a fulcrum. The links I rocking at IIO their rear ends on the pin K, the cut-out portions of the links pass over the pin J and draw the stub-shaft F rearwardly by means of block H and assumes the position shown in Figs. 2 and 5. This movement of the stubshaft F puts the saw-blade under tension and holds it immovably in position. The lever K is prevented from being pushed entirely through the open part of the handle B by the pin kt, flttin in the slot k3.

By the use o my improvements various lengths of saw-blades can be used, and the blades can be readily removed when desired or tension removed from the same and the proper strain put on the blades while in use. By means of the key b and the set-screw b2 the stub-shaft F can be securely locked against accidental displacement.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a saw-frame having an open handle and an arm at its forward end adapted to be connected with the forward end of a saw-blade, of a blade-straining device consisting of a lever pivoted within said handle, said lever having a forward eX- tension provided with side projections having square shoulders, a stub-shaft journaled in said handle and provided at its forward ends Awith means for connection with the rear end of a saw-blade, a block secured to the rear end of the stub-shaft, links pivotally secured at their forward ends to said block, and at their rear ends to the lever, said links having slots or cut-out places in their lower ends to pass over the pivot of the lever, the front wall of said slots being straight and adapted to abut the square shoulders of the side projections on the lever, when in its locked position.

2. rlhe combination with a saw-frame having an open handle and an arm at its forward end adapted to be secured to the forward end of a saw-blade, of a blade-straining device consisting of a lever pivoted within said handle, said lever having a forward extension provided with side projections, a stub-shaft journaled in said handle, and provided at its forward end with a flattened extension having a rearwardly-projecting hook on its side face, a block detachably secured to the rear end of the stub-shaft, side links pivotally secured at their forward ends to said block and at their rear ends to the lever, said links having slots or cut-out places in their lower edges to pass over the pivot of the lever and to fit the faces of the projections, and a saw-blade removably secured at its forward end to the forward arm of the saw-frame, and having an elongated slot at its rear end to pass over the rearwardly-projecting hook on the forward extension of the stub-shaft.

3. The combination with a saw-frame, an open handle and an arm at its forward end adapted to be secured to the forward end of a saw-blade, of a blade-straining device consisting of a lever pivoted within said handle, said lever having a forward extension provided with side projections, a stub-shaft j ournaled in said handle and provided at its forward end with a flattened extensionl having a rearwardly-projecting hook on its side face, a key fitted between the stub-shaft and the handle, a set-screw passing through the side wall of said handle and engaging said key, a block detachably secured to the rear end of the stub-shaft, side links pivotally secured at their forward ends to said block and at their rear ends to the lever, said links having slots or cut-out places in their lower edges to pass over the pivot of the lever and to fit the faces of the projections1 and a saw-blade removably secured at its forward end to the forward arm of the saw-frame and having an elongated slot at its rear end to pass over the rearwardly-projecting hook on the forward extension of the stub-shaft.

ANTON ADAMKIEWITZ.

Witnesses:

CHAs. W. AUSTIN, JAMES A. BLACK. 

